Use dtruss on Mac OS. The dtrace subsystem has become harder to use, though, with system protection active. Supposedly you can get it running again through thes

Use dtruss on Mac OS. The dtrace subsystem has become harder to use, though, with system protection active. Supposedly you can get it running again through these tricks https://apple.stackexchange.com/questions/208762/now-that-el-capitan-is-rootless-is-there-any-way-to-get-dtrace-working https://apple.stackexchange.com/questions/208762/now-that-el... but haven't tried it out yet, as I had no need since my Yosemite upgrade to trace syscalls.